FTTB: Fiber To The Building. This is in reference to fiber optic cable, carrying network data, connected all the way from an Internet service provider to a customer’s physical building.FTTD: Fiber To The Desk.. FTTD indicates applications where fiber optic connections are distributed from the central office to individual work stations or computers inside a structure, dwelling, or building.FTTN: Fiber to the node. FTTN is also called fiber to the neighborhood or fiber to the cabinet (FTTCab). It is a telecommunication architecture based on fiber-optic cables run to a cabinet serving a neighborhood.FTTC: Fiber To The Curb. This is also called fibre to the kerb (FTTK). It is a telecommunications system based on fiber-optic cables run to a platform that serves several customers. Each of these customers has a connection to this platform via coaxial cable or twisted pair.